Thing is, the absolutely worst things that he's done throughout his career have been pretty mainstream at the time. Like that omnibus crime bill? That was overwhelmingly supported, with only very, very limited Democratic opposition in very limited areas. (And a lot of black communities still support 'tough on crime' approaches because they look at the short term rather than the long.)
Even the support of Israel is pretty middle-of-the-road. Most Dems still support Israel, even while being appalled at the indiscriminate nature of Israel's violence in Gaza